tree 03a8a90b71a75dfc60b468fc541d59731b92470a
parent c9eaa447e77efe77b7fa4c953bd62de8297fd6c5
author Geert Uytterhoeven <geert+renesas@glider.be> 1400782055 +0200
committer Mark Brown <broonie@linaro.org> 1401111037 +0100

spi: rspi: Round up division to avoid slave overclocking

The calculation of the bit rate divider used a standard C division, which
rounds down the quotient. This may lead to a higher bitrate than requested.
Round up to avoid this.

E.g. on Koelsch, the SPI flash (configured for 30 MHz) was driven at 48.75
MHz. After this patch it's driven at a safe 24.375 MHz.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>